Hi Aleks, great question! For example if you had a meeting and the other person didn't show up, you cant do anything about it. You can control if you will be sad or neutral about it, but you cant control the fact that the person didn't show up. Or if you were supposed to buy a house and an earthquake demolished the house 1 week before you were supposed to buy it. Big problem? Yes. Can you do something about that? No. Hehe. Have a good weekend.